Running a forecast fails, while a gas is being spent

Sometimes people try to run their forecasts and fail to achieve that. It can happen for several reasons. One of them is high Ethereum network workload. Sometimes people change values for Gas price and Gas Limit fields which also can lead to a failure when running forecast for a project. It is not recommended to change these values, as they are selected by the system as optimal ones, basing on a current Ethereum network state. The symptoms of successful run of a forecast is that one's forecast is appearing at Project --> Valuation and feedback above the forecasting chart. During running forecasts with no success, one spends some funds - but it is inevitable condition of functioning the system